Common Core: F-IF.4
Problem 18 of 18a1-018
The graph of is a parabola. What is its vertex, and which way does it open?
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Solution walkthrough2:03
- A factor of makes , so the -intercepts are and .
- A parabola is symmetric, so its axis is halfway between the intercepts: .
- Put in: . The vertex is .
- The minus in front means the term is , so it opens down and is the top point.
- Traps: ignores the minus; flips signs; is the -intercept.